High cross-voltage cholesteric LCD display screen driving method and system supporting partial refresh

Abstract

The present invention discloses a high-voltage cholesteric LCD display driving method and system supporting local refresh, comprising the following steps: generating a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image; determining a non-refresh area and a refresh area according to the frame rate switching instruction; generating a gate drive signal based on the non-refresh area and the refresh area, and generating a source drive signal and a common electrode signal according to the gate drive signal; inputting the gate drive signal, the source drive signal, and the common electrode signal to drive the LCD display. The high-voltage cholesteric LCD display driving method and system supporting local refresh of the present application realizes charging pixel units with high voltage row by row, supports high voltage local refresh, and eliminates the problem of unequal display width.

Description

Technical Field

[0001] The present invention relates to the technical field of cholesteric LCD display screens, and in particular to a high cross-voltage cholesteric LCD display screen driving method and system supporting local refresh. Background Art

[0002] like Figure 1 As shown, the conventional cholesteric LCD adopts a design method of a whole-surface common voltage Vcom, and the common voltage Vcom is connected and conducted through the conductive glue and silver paste of the TFT substrate and the CF substrate. Figure 3 As shown in the figure, the traditional display screen has the problem of uneven peripheral display width. The main reason for the peripheral defect is the Vcom voltage of the entire surface. Due to the large impedance difference between the near end and the far end, the impedance difference is 9K~11KΩ, resulting in different degrees of difference in voltage between the near and far ends. Different differences will lead to different reflectivity, which ultimately affects the uniformity of the display. In addition, the common voltage Vcom cannot be controlled in different areas, resulting in the inability to achieve local refresh scanning. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a high cross-voltage cholesteric LCD display screen driving method and system supporting local refresh.

[0004] The high cross-voltage cholesteric LCD display screen driving method supporting partial refresh proposed by the present invention comprises the following steps:

[0005] Generate a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image;

[0006] Determine the non-refresh area and the refresh area according to the frame rate switching instruction;

[0007] Generate a gate drive signal based on the non-refresh area and the refresh area, and generate a source drive signal and a common electrode signal according to the gate drive signal;

[0008] Input gate drive signal, source drive signal and common electrode signal to drive LCD display screen;

[0009] When the gate drive signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source drive signal Source The polarity changes in the opposite direction, and the corresponding pixel units are charged row by row with high voltage in the refresh area to display the next frame of image information in the refresh area;

[0010] The voltage range of the common voltage Vcom is -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V.

[0011] Preferably, determining the non-refresh area and the refresh area according to the frame rate switching instruction specifically includes:

[0012] Determine the display change area within a picture refresh cycle according to the frame rate switching instruction;

[0013] Matching the display size of the display change area with the display panel of the LCD display screen to determine a refresh area that matches the display panel;

[0014] The area outside the refresh area on the display panel is defined as a non-refresh area.

[0015] Preferably, the LCD display screen includes a display panel, the display panel includes a gate driving circuit, a plurality of gate lines arranged in rows, a plurality of pixel units, and a plurality of source lines arranged in columns, the gate driving circuit drives and controls the plurality of gate lines arranged in rows, and the gate driving signal is generated based on the non-refresh area and the refresh area, specifically including:

[0016] Based on a one-to-one correspondence between the non-refresh area and the refresh area of ​​the display panel of the LCD display screen and the gate lines arranged in multiple rows of the display panel within a picture refresh cycle, a non-refresh area or a refresh area corresponding to each gate line is obtained;

[0017] Generate a gate drive signal for row scanning refresh of the display panel according to the arrangement order of the gate lines arranged in a plurality of rows and the non-refresh area or refresh area corresponding to each gate line;

[0018] When the row scan reaches the refresh area, the gate line of the corresponding row is turned on and the pixel is charged. At this time, the row scanning frequency corresponding to the gate drive signal is f;

[0019] When the row scan reaches the non-refresh area, the gate line of the corresponding row is turned off. At this time, the row scanning frequency corresponding to the gate drive signal is mf, where m≥100.

[0020] Preferably, each gate line arranged in a row corresponds to a pixel unit, and each pixel unit corresponds to a source line arranged in a column.

[0021] Preferably, the generating of the source driving signal and the common electrode signal according to the gate driving signal specifically includes:

[0022] When the gate drive signal scans the non-refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V Source All remain at 0V, and the non-refresh area retains the previous frame of image information.

[0023] Preferably, the display panel includes a CF substrate, and the common electrode signal is input from the CF substrate side through the gate driving circuit.

[0024] The high cross-voltage cholesteric LCD display screen driving system supporting partial refresh proposed by the present invention comprises:

[0025] A data generation module, used for generating a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image;

[0026] An area division module, used to determine a non-refresh area and a refresh area according to a frame rate switching instruction;

[0027] A first drive generating module, used for generating a gate drive signal based on a non-refresh area and a refresh area;

[0028] A second drive generating module, used for generating a source drive signal and a common electrode signal according to the gate drive signal;

[0029] A driving module, used for inputting a gate driving signal, a source driving signal, and a common electrode signal to drive an LCD display screen;

[0030] During the operation of the driving module, when the gate driving signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source driving signal are Source The polarity changes in the opposite direction, and the corresponding pixel units are charged with high voltages row by row in the refresh area to display the next frame of image information in the refresh area; the voltage range of the common voltage Vcom is specifically -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V.

[0031] The present invention provides a display screen, wherein the display driving method of the display screen is any one of the display screen driving methods described above.

[0032] In the present invention, the proposed high-cross-voltage cholesteric LCD display driving method and system supporting local refresh outputs a common voltage Vcom through a gate driving circuit on the CF substrate side, and keeps the line scan synchronization with the TFT substrate. The common voltage Vcom scans in units of lines, and keeps synchronization with the charging line scan of the pixel unit on the TFT substrate side, which can reduce the difference between the far and near end resistances to about 5Ω, thereby completely eliminating the problem of unequal display widths. Compared with the traditional driving timing, the present invention adds a common voltage Vcom on the CF substrate side. When the gate of the corresponding row is opened to charge the pixel, the common voltage Vcom is given a voltage with the opposite polarity to the source voltage. The scanning is completed from the first row to the last row of the gate line, realizing the high-cross-voltage charging of the pixel unit row by row, and supporting high-cross-voltage local refresh of the LCD display. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the traditional reflective LCD / ink screen driving structure;

[0034] Figure 2 A schematic diagram of a cholesteric LCD driving implementation structure of a high cross-voltage cholesteric LCD display screen driving method supporting partial refresh proposed by the present invention;

[0035] Figure 3 This is a schematic diagram of poor display width under traditional driving;

[0036] Figure 4 A schematic diagram of a partial refresh timing sequence of a high cross-voltage cholesteric LCD display screen driving method supporting partial refresh proposed by the present invention;

[0037] Figure 5 A schematic diagram of a basic driving architecture of a high cross-voltage cholesteric LCD display screen driving method supporting partial refresh proposed by the present invention;

[0038] Figure 6 A schematic diagram of the working process structure of the high cross-voltage cholesteric LCD display screen driving method supporting partial refresh proposed by the present invention;

[0039] Figure 7 This is a schematic diagram of the system architecture of the high cross-voltage cholesteric LCD display screen driving system supporting partial refresh proposed by the present invention. DETAILED DESCRIPTION

[0040] Reference Figure 1-7 The present invention proposes a high cross-voltage cholesteric LCD display driving method supporting partial refresh, wherein the LCD display includes a display panel, the display panel includes a gate driving circuit, a plurality of gate lines arranged in rows, a plurality of pixel units, and a plurality of source lines arranged in columns, and the gate driving circuit drives and controls the plurality of gate lines arranged in rows, comprising the following steps:

[0041] Step S1, generating a frame rate switching instruction according to pre-stored switching information between the Nth frame image and the N+1th frame image.

[0042] In this embodiment, each gate line arranged in a row corresponds to a pixel unit, and each pixel unit corresponds to a source line arranged in a column.

[0043] In this embodiment, the display panel includes a TFT substrate and a CF substrate, and the common electrode signal is input from the CF substrate side through the gate driving circuit.

[0044] In this embodiment, if Figure 5As shown, the display panel includes pixel units, each pixel unit is charged and connected to the source line, the source line is on the TFT substrate side, connected in the column direction, the gate line is on the TFT substrate side, connected in the horizontal direction, the common voltage is on the CF substrate side, and is formed by flattening a transparent conductive film. The material is a whole surface of indium tin oxide. The pixel capacitor is formed by Vcom on the CF substrate side, metal on the TFT substrate side, and the intermediate liquid crystal.

[0045] In this embodiment, the switching information specifically includes: in which blanking phase of the frame to switch the frame rate during the display process of the display device, for example: the frame rate is switched to 120Hz in the blanking phase of the odd frame, and the frame rate is switched to 60Hz in the blanking phase of the even frame, but is not limited thereto. The switching information can be preset or adjusted in real time.

[0046] Step S2: determining a non-refresh area and a refresh area according to a frame rate switching instruction.

[0047] In this embodiment, step S2 specifically includes:

[0048] Determine the display change area within a picture refresh cycle according to the frame rate switching instruction;

[0049] Matching the display size of the display change area with the display panel to determine a refresh area that matches the display panel;

[0050] The area outside the refresh area on the display panel is defined as a non-refresh area.

[0051] Step S3: generating a gate driving signal based on the non-refresh area and the refresh area.

[0052] In this embodiment, step S3 specifically includes:

[0053] Based on a one-to-one correspondence between the non-refresh area and the refresh area of ​​the display panel and the gate lines arranged in multiple rows of the display panel within a picture refresh cycle, a non-refresh area or a refresh area corresponding to each gate line is obtained;

[0054] Generate a gate drive signal for row scanning refresh of the display panel according to the arrangement order of the gate lines arranged in a plurality of rows and the non-refresh area or refresh area corresponding to each gate line;

[0055] When the row scan reaches the refresh area, the gate line of the corresponding row is turned on and the pixel is charged. At this time, the row scanning frequency corresponding to the gate drive signal is f;

[0056] When the row scan reaches the non-refresh area, the gate line of the corresponding row is turned off. At this time, the row scanning frequency corresponding to the gate drive signal is mf, where m≥100.

[0057] Step S4: generating a source driving signal and a common electrode signal according to the gate driving signal.

[0058] In this embodiment, step S4 specifically includes:

[0059] When the gate drive signal scans the non-refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V Source All remain at 0V, and the non-refresh area retains the image information of the previous frame;

[0060] When the gate drive signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source drive signal Source The polarity changes in the opposite direction, and the corresponding pixel units are charged row by row with a high voltage in the refresh area to display the next frame of image information in the refresh area.

[0061] In this embodiment, the voltage range of the common voltage Vcom is specifically -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V.

[0062] In this embodiment, compared with the traditional driving timing, the present invention adds a common voltage Vcom on the CF substrate side. When the gate of the corresponding row is opened to charge the pixel, a voltage with the opposite polarity of the source voltage is given to the common voltage Vcom. The scanning is completed from the first row to the last row of the gate line, and the pixel unit is charged with a high voltage line by line. The gate driving circuit supports up to ±40V, and with the maximum source voltage voltage of 50V (±25V), a high voltage of up to 130V can be achieved.

[0063] In this embodiment, the pixel charging process is specifically as follows: the gate outputs a voltage VGH, the TFT substrate is opened, and the source voltage is charged into the pixel electrode from the D pole of the TFT substrate; after one stage, the gate voltage is pulled down to VGL, the TFT substrate is closed, and the voltage of the pixel electrode is maintained until the next frame; the gate opens the next row and repeats the above process, scanning row by row until the last row is scanned.

[0064] Step S5: inputting the gate driving signal, the source driving signal, and the common electrode signal to drive the LCD display screen.

[0065] In this embodiment, a common voltage Vcom is outputted through a gate driving circuit on the CF substrate side, and is synchronized with the line scan of the TFT substrate. The common voltage Vcom is scanned in units of lines, and is synchronized with the charging line scan of the pixel unit on the TFT substrate side. The difference in resistance between the far and near ends can be reduced to about 5Ω, thereby completely eliminating the problem of unequal display widths.

[0066] In this embodiment, the common voltage Vcom on the CF substrate side can be scanned row by row, and the gate drive circuit supports up to ±40V. With the maximum source voltage of 50V (±25V), a high voltage (50+80V, up to 130V) can be achieved. Figure 4 As shown in the figure, the non-refreshing part is only scanned gradually and quickly from the first row of gate lines, and the scanning rate is 100 times that of the normal scanning. During this period, Vcom and data remain at 0V, and the non-refreshing area retains the data of the previous picture; when scanning to the refresh area, the scanning time returns to normal, and the common voltage Vcom and the source voltage V Source Opposite polarity achieves high cross-voltage.

[0067] Reference Figure 1-7 The high cross-voltage cholesteric LCD display screen driving system supporting partial refresh proposed by the present invention comprises:

[0068] A data generation module, used for generating a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image;

[0069] An area division module, used to determine a non-refresh area and a refresh area according to a frame rate switching instruction;

[0070] A first drive generating module, used for generating a gate drive signal based on a non-refresh area and a refresh area;

[0071] A second drive generating module, used for generating a source drive signal and a common electrode signal according to the gate drive signal;

[0072] A driving module, used for inputting a gate driving signal, a source driving signal, and a common electrode signal to drive an LCD display screen;

[0073] During the operation of the driving module, when the gate driving signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source driving signal are Source The polarity changes in the opposite direction, and the corresponding pixel units are charged with high voltages row by row in the refresh area to display the next frame of image information in the refresh area; the voltage range of the common voltage Vcom is specifically -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V.

[0074] The present invention provides a display screen, and a display driving method of the display screen is any one of the display screen driving methods mentioned above.

[0075] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0076] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0077] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0078] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0079] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0080] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high cross-voltage cholesteric LCD display driving method supporting partial refresh, characterized in that: The following steps are involved: Generate a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image; Determine the non-refresh area and the refresh area according to the frame rate switching instruction; Generate a gate drive signal based on the non-refresh area and the refresh area, and generate a source drive signal and a common electrode signal according to the gate drive signal; Input gate drive signal, source drive signal and common electrode signal to drive LCD display screen; When the gate drive signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source drive signal Source The polarity changes in the opposite direction, and the corresponding pixel units are charged row by row with high voltage in the refresh area to display the next frame of image information in the refresh area; When the gate drive signal scans the non-refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source drive signal Source All are kept at 0V, and the non-refresh area keeps the image information of the previous frame; The LCD display screen includes a display panel, the display panel includes a gate driving circuit, a plurality of gate lines arranged in rows, a plurality of pixel units, and a plurality of source lines arranged in columns, the gate driving circuit drives and controls the gate lines arranged in the plurality of rows, and the gate driving signal is generated based on the non-refresh area and the refresh area, specifically including: Based on a one-to-one correspondence between the non-refresh area and the refresh area of ​​the display panel of the LCD display screen and the gate lines arranged in multiple rows of the display panel within a picture refresh cycle, a non-refresh area or a refresh area corresponding to each gate line is obtained; Generate a gate drive signal for row scanning refresh of the display panel according to the arrangement order of the gate lines arranged in a plurality of rows and the non-refresh area or refresh area corresponding to each gate line; When the row scan reaches the refresh area, the gate line of the corresponding row is turned on and the pixel is charged. At this time, the row scanning frequency corresponding to the gate drive signal is f; When the row scan reaches the non-refresh area, the gate line of the corresponding row is closed. At this time, the row scanning frequency corresponding to the gate drive signal is mf, where m≥100; The voltage range of the common voltage Vcom is -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V.

2. The high cross-voltage cholesteric LCD display screen driving method supporting partial refresh according to claim 1, characterized in that: The determining of the non-refresh area and the refresh area according to the frame rate switching instruction specifically includes: Determine the display change area within a picture refresh cycle according to the frame rate switching instruction; Matching the display size of the display change area with the display panel of the LCD display screen to determine a refresh area that matches the display panel; The area outside the refresh area on the display panel is defined as a non-refresh area.

3. The high cross-voltage cholesteric LCD display screen driving method supporting partial refresh according to claim 1, characterized in that: Each gate line arranged in a row corresponds to a pixel unit, and each pixel unit corresponds to a source line arranged in a column.

4. The high cross-voltage cholesteric LCD display screen driving method supporting partial refresh according to claim 1, characterized in that: The display panel includes a CF substrate, and a common electrode signal is input from the CF substrate side through a gate driving circuit.

5. A high cross-voltage cholesteric LCD display screen driving system supporting partial refresh, characterized in that: include: A data generation module, used for generating a frame rate switching instruction according to pre-stored switching information of the Nth frame image and the N+1th frame image; An area division module, used to determine a non-refresh area and a refresh area according to a frame rate switching instruction; A first drive generating module, used for generating a gate drive signal based on a non-refresh area and a refresh area; A second drive generating module, used for generating a source drive signal and a common electrode signal according to the gate drive signal; A driving module, used for inputting a gate driving signal, a source driving signal, and a common electrode signal to drive an LCD display screen; During the operation of the driving module, when the gate driving signal scans the refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V corresponding to the source driving signal are Source The polarity changes in the opposite direction, and the corresponding pixel units are charged row by row with high voltage in the refresh area to display the next frame of image information in the refresh area; When the gate drive signal scans the non-refresh area, the common voltage Vcom corresponding to the common electrode signal and the source voltage V Source All remain at 0V, and the non-refresh area retains the image information of the previous frame; the cross-voltage range of the common voltage Vcom is specifically -40V≤Vcom≤+40V; the source voltage V Source The voltage range is -25V≤V Source ≤+25V; The LCD display screen includes a display panel, the display panel includes a gate driving circuit, a plurality of gate lines arranged in rows, a plurality of pixel units, and a plurality of source lines arranged in columns, the gate driving circuit drives and controls the plurality of gate lines arranged in rows, and during the operation of the first driving generation module, the gate driving signal is generated based on the non-refresh area and the refresh area, specifically including: one-to-one area matching is performed based on the non-refresh area and the refresh area of ​​the display panel of the LCD display screen within a picture refresh cycle and the gate lines arranged in rows of the display panel to obtain a non-refresh area or a refresh area corresponding to each gate line; a gate driving signal for row scanning and refreshing of the display panel is generated according to the arrangement order of the gate lines arranged in rows and the non-refresh area or the refresh area corresponding to each gate line; when the row scan reaches the refresh area, the gate line of the corresponding row is turned on and the pixel is charged, and at this time, the row scanning frequency corresponding to the gate driving signal is f; when the row scan reaches the non-refresh area, the gate line of the corresponding row is turned off, and at this time, the row scanning frequency corresponding to the gate driving signal is mf, wherein m≥100.

6. A display screen, characterized in that: The display driving method of the display screen is the display driving method of the display screen according to any one of claims 1 to 4.

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